Anyone Knows Where Yellow Wire Goes To behind alternator - Nissan : Datsun ZCar forum :Nissan Z Forum: 240Z to 370Z
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post #1 of 9 (permalink) Old 01-22-2019, 01:45 PM Thread Starter
DGS
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Question Anyone Knows Where Yellow Wire Goes To behind alternator

I searched the forum but could not find a similar issue.
It is on a 1985 300ZX Naturally Aspirated Engine, manual, with A/C.
I found a single small (16 gauge) hanging wire, coming from back of alternator post connector.
It is a single yellow (or light brown) coming from back of alternator, then goes into a single type connector casing, then the hanging end of the wire is black.

I posted a few pictures to show what I am looking at.
The FSM does not show or refers to that wire at all I attached a picture of the page 24 of the FSM.

Does anyone know where that small wire is supposed to connect to?

Thanks in advance.
Attached Images
File Type: jpg IMG_20190122_110057_BTEXT.jpg (157.6 KB, 14 views)
File Type: jpg IMG_20190122_110057_TEXT.jpg (158.9 KB, 8 views)
File Type: jpg IMG_20190122_110137_bTEXT.jpg (139.3 KB, 9 views)
File Type: jpg IMG_20190122_111017.jpg (148.2 KB, 7 views)
File Type: jpg AlternatorConnection.JPG (21.5 KB, 6 views)

DGS in Alabama
85 300ZX

Last edited by DGS; 01-22-2019 at 11:14 PM. Reason: more information
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post #2 of 9 (permalink) Old 01-22-2019, 11:46 PM Thread Starter
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So after further research it could be a wire for a condenser that should be bolted to the back of the alternator to keep static out of the radio.

Could that be it?
Where to get that Condenser Noise Filter Suppressor for the alternator?

Any help would be appreciated.

DGS in Alabama
85 300ZX
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post #3 of 9 (permalink) Old 01-23-2019, 01:15 AM Thread Starter
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I found a thread that shows what I think is missing on mine.
The wire is exactly the same.
I attached a picture of it.

Can I buy any similar condenser from any car part store or does it need to be a certain kind of condenser?

There is also a condenser next to the ignition coil not sure if I can use a similar condenser.

There is no information at all in the FSM.
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File Type: jpg AlternatorCondenserExample.JPG (24.0 KB, 4 views)

DGS in Alabama
85 300ZX

Last edited by DGS; 01-23-2019 at 01:23 AM.
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post #4 of 9 (permalink) Old 01-23-2019, 01:21 AM Thread Starter
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Here is the picture of possible missing condenser bolted to alternator and connected to positive post. The role of the condenser is to suppress parasitic interference with radio reception and sound.

The question is does it have to be of a certain kind or any ignition condenser would work?

Thanks in advance for any help.
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File Type: jpg AlternatorCondenserExample.JPG (24.0 KB, 2 views)

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85 300ZX
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post #5 of 9 (permalink) Old 01-23-2019, 02:30 AM
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No reason it can't be a generic condenser for ignition. The capacitor is fairly forgiving as long as it's rated for 12VDC or up, which any from an auto parts store will be. (A larger condenser will be capable or providing more noise suppression but if too large just takes up extra space.)
Keep the clip. The new one may not have a clip with it.

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post #6 of 9 (permalink) Old 01-23-2019, 09:09 AM Thread Starter
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Quote:
Originally Posted by dumbestone View Post
No reason it can't be a generic condenser for ignition. The capacitor is fairly forgiving as long as it's rated for 12VDC or up, which any from an auto parts store will be. (A larger condenser will be capable or providing more noise suppression but if too large just takes up extra space.)
Keep the clip. The new one may not have a clip with it.
Thanks for the information it helps a lot. The auto parts store states 'Doesn't Fit your 1985 Nissan 300ZX" but I am not sure how they can know that for an ignition condenser.

Please one more question: The small hanging wire is connected to the large wire post (Bat) I believe. I am always hesitant to connect a positive to a ground like that. There is no trace of the old one, I think it was never re-installed when the alternator was replaced.

So I should mount the condenser to the body of the alternator and solder its wire to the existing hanging one?

Again thanks.

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85 300ZX
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post #7 of 9 (permalink) Old 01-24-2019, 02:43 AM
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There is a condenser shown in the circuit diagrams on both the digital dash and analog (needles) dash, with the wire of the condenser attached to the wire (or alternator circuit bolt if it is not a plug/socket connection) that goes from the alternator to the fusible link.

You should verify this by downloading the "1985 300ZX Factory Service Manual" (Google) to get the file from Xenonxcar.com and look at Circuit1 (digital)and Circuit 2 (analog) wiring diagrams from the file folder list.

Condensers (capacitors) are made to have the positive, in this case center wire, connected to the voltage and the case grounded by the strap and bolt. The internal wraps of foil are separated by a "non-conductive" film to allow a charge to build up between the pos and neg foils.

But don't do it on my sayso without further clarification in your mind.

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post #8 of 9 (permalink) Old 01-24-2019, 10:56 AM Thread Starter
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Quote:
Originally Posted by dumbestone View Post
There is a condenser shown in the circuit diagrams on both the digital dash and analog (needles) dash, with the wire of the condenser attached to the wire (or alternator circuit bolt if it is not a plug/socket connection) that goes from the alternator to the fusible link.

You should verify this by downloading the "1985 300ZX Factory Service Manual" (Google) to get the file from Xenonxcar.com and look at Circuit1 (digital)and Circuit 2 (analog) wiring diagrams from the file folder list.

Condensers (capacitors) are made to have the positive, in this case center wire, connected to the voltage and the case grounded by the strap and bolt. The internal wraps of foil are separated by a "non-conductive" film to allow a charge to build up between the pos and neg foils.

But don't do it on my sayso without further clarification in your mind.
Thank you again.
I have the hard copy of the 1984 Nissan 300ZX Service manual but I will download the 1985.

It is correct the hanging wire with the female bullet terminal is connected to the cable that screws onto a circuit bolt (10 mm copper nut).

You reassured me, I think I can take it from there.
Hopefully this will also help other forum's members.

Your help is very appreciated.

DGS in Alabama
85 300ZX
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post #9 of 9 (permalink) Old 01-25-2019, 03:37 PM
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This is an extra power supply from the ALT to what ever you need to power up.
It's kinda a direct 12V power supply to what ever you need.

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